package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import io.swagger.models.auth.In;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WorkspaceService workspaceService;
    /**
     * 统计指定时间区域内的营业额度
     * @param begin
     * @param end
     * @return
     */
    @Override
    public TurnoverReportVO getTurnover(LocalDate begin, LocalDate end) {

        List<LocalDate> dateList = new ArrayList<>();

        while (!begin.equals(end.plusDays(1))) {
            dateList.add(begin);
            begin = begin.plusDays(1);
        }

        List<Double> turnoverList = new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);

            Double turnover = orderMapper.sumByMap(map);

            turnoverList.add(turnover == null ? 0.0 : turnover);
        }

        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();
    }

    /**
     * 根据时间选择区间，展示每天的用户总量和新增用户量数据
     * @param begin
     * @param end
     * @return
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {

        List<LocalDate> dateList = new ArrayList<>();

        while (!begin.equals(end.plusDays(1))) {
            dateList.add(begin);
            begin = begin.plusDays(1);
        }

        List<Integer> totalUserList = new ArrayList<>();
        List<Integer> newUserList = new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Integer totalUser = getUserCount(null, endTime);
            Integer newUser = getUserCount(beginTime, endTime);

            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }

        return UserReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .build();
    }

    /**
     * 根据时间区间统计用户数量
     * @param beginTime
     * @param endTime
     * @return
     */
    private Integer getUserCount(LocalDateTime beginTime, LocalDateTime endTime) {
        Map map = new HashMap();
        map.put("begin",beginTime);
        map.put("end", endTime);
        return userMapper.countByMap(map);
    }

    /**
     * 根据时间选择区间，展示每天的订单总数和有效订单数
     * @param begin
     * @param end
     * @return
     */
    @Override
    public OrderReportVO getOrdersStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();

        while (!begin.equals(end.plusDays(1))) {
            dateList.add(begin);
            begin = begin.plusDays(1);
        }
        //每天订单总数集合
        List<Integer> totalOrderList = new ArrayList<>();
        //每天有效订单数集合
        List<Integer> validOrderList = new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            //查询每天的总订单数
            Integer totalOrder = getOrderCount(beginTime,endTime,null);
            //查询每天的有效订单数
            Integer validOrder = getOrderCount(beginTime,endTime,Orders.COMPLETED);

            totalOrderList.add(totalOrder);
            validOrderList.add(validOrder);
        }
        //时间区间内的总订单数
        Integer totalOrderCount = totalOrderList.stream().reduce(Integer::sum).get();
        //时间区间内的总有效订单数
        Integer validOrderCount = validOrderList.stream().reduce(Integer::sum).get();

        //订单完成率
        Double orderCompletionRate = 0.0;
        if (totalOrderCount > 0) {
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }
        return OrderReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(totalOrderList, ","))
                .validOrderCountList(StringUtils.join(validOrderList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 根据时间选择区间，展示每天的订单总数和有效订单数
     * @param beginTime
     * @param endTime
     * @param status
     * @return
     */
    private Integer getOrderCount(LocalDateTime beginTime, LocalDateTime endTime, Integer status) {
        Map map = new HashMap();
        map.put("begin",beginTime);
        map.put("end", endTime);
        map.put("status",status);
        return orderMapper.countByMap(map);
    }

    /**
     * 销量排名Top10
     * @param begin
     * @param end
     * @return
     */
    @Override
    public SalesTop10ReportVO getTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        List<GoodsSalesDTO> goodsSalesDTOList = orderMapper.getSalesTop10(beginTime, endTime);

        List<String> nameList = goodsSalesDTOList.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        List<Integer> numberList = goodsSalesDTOList.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());

        return SalesTop10ReportVO.builder()
                .nameList(StringUtils.join(nameList, ","))
                .numberList(StringUtils.join(numberList, ","))
                .build();
    }

    /**
     * 导出运营数据报表
     */
    @Override
    public void exportXlsx(HttpServletResponse response) {
        read(response);
    }

    private void read(HttpServletResponse response) {
        LocalDate begin = LocalDate.now().minusDays(30);
        LocalDate end = LocalDate.now().minusDays(1);

        //查询概览运营数据，提供给Excel模板文件
        BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(begin,LocalTime.MIN),LocalDateTime.of(end,LocalTime.MAX));
        //从类路径下加载文件,返回文件的输入流
        InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

        try {
            //基于提供好的模板文件创建一个新的Excel表格对象
            XSSFWorkbook excel = new XSSFWorkbook(inputStream);
            XSSFSheet sheet = excel.getSheet("Sheet1");
            XSSFRow row = sheet.getRow(1);

            //时间区域
            row.getCell(1).setCellValue(begin + "至" + end);

            row = sheet.getRow(3);
            //营业额
            row.getCell(2).setCellValue(businessData.getTurnover());

            //订单完成率
            row.getCell(4).setCellValue(businessData.getOrderCompletionRate());

            //新增用户数
            row.getCell(6).setCellValue(businessData.getNewUsers());

            row = sheet.getRow(4);
            //有效订单
            row.getCell(2).setCellValue(businessData.getValidOrderCount());

            //平均客单价
            row.getCell(4).setCellValue(businessData.getUnitPrice());

            for (int i = 0; i < 30; i++) {
                row = sheet.getRow(i + 7);
                LocalDate date = begin.plusDays(i);

                //日期
                row.getCell(1).setCellValue(date.toString());

                businessData = workspaceService.getBusinessData(LocalDateTime.of(date,LocalTime.MIN),LocalDateTime.of(date,LocalTime.MAX));

                //营业额
                row.getCell(2).setCellValue(businessData.getTurnover());

                //有效订单
                row.getCell(3).setCellValue(businessData.getValidOrderCount());

                //订单完成率
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());

                //平均客单价
                row.getCell(5).setCellValue(businessData.getUnitPrice());

                //新增用户数
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

            //通过输出流下载 Excel
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //关闭资源
            out.flush();
            out.close();
            excel.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
